Will changing out my cats for better flowing ones make much of a difference with my current set-up? How much difference in HP or torque?
What kind is recommended that meets C.A.R.B.?
Bolt on? or Weld?
Thanks!!

 

siamese

your factory cats actually flow really good. i wouldnt wory about it.

 

He's right...your OEM cats flow pretty darn good as compared to the older ones.....but if you insist on more flow.....just cut them off and gut them! I gutted mine, in all of an hour and had my Pipeline working friend to weld them back up real nice. Works for me...and cheaper too....

Amazing what a Sawzall and a slate bar can do!

 

You will pick up more than you think regarless of how the newer cats flow in comparison to the older ones the stock y pipe and cats flow like **** next to a straight through design. You will pick up alot more than you think get rid of the crappy stock y pipe while your at it. In my opinion this is a must do mod especially if you go with an aftermarket cam.
Just to give you an idea after I redid the stock y pipe with no cats, mandrel u bends, flowmaster ypipe and a cutout I picked up around .35 in the 1/8th costs me 200 bucks to do it with someone else welding